﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace _7
{
    class Program
    {
        static void Main(string[] args)
        {
           
            int i = 1;
            while (i < 21)
            {
                if (i%2==0)
                {
                    Console.WriteLine(i);   
                }
                i++;                         
            }
            Console.ReadKey();
        }
    }
}
